The Price of Waiting

Somewhere around the thirteenth century, a theologian sat down and tried to work out whether charging interest on a loan was actually a sin. His conclusion was yes, absolutely, obviously – and the reasoning is stranger and more interesting than you might expect. He wasn't worried about exploitation, exactly. He was worried about time.

Selling Time Itself

Charging interest, in the medieval Church's view, meant selling time itself. And time, they argued, belonged to God. You couldn't sell what wasn't yours.

It sounds absurd now. But strip away the theology and the argument is surprisingly precise. Interest rates really are a price charged for time – specifically, for the gap between having money now and having it later. When the Bank of England moves its base rate up or down, what it is really doing is repricing that gap. A higher rate says: waiting is worth more; present money is scarce; borrow it and you'll pay heavily for the privilege. A lower rate says the opposite. The number changes, but the question underneath it is the same one the medieval theologians were wrestling with: what is a moment of financial time actually worth?

For Centuries the Answer Was Zero

For centuries, the official answer was zero. Usury laws across Europe made interest-charging illegal, or at least ungodly. The work got done anyway – mostly by people the laws didn't apply to, which tells you everything you need to know about how well moral prohibitions work when there's profit involved. Gradually, thinkers started making the economic case that future money genuinely is worth less than present money. Not as a moral observation, but as a fact about how the world works. A harvest promised next autumn is less valuable than grain in your hands today, because you might die, the crop might fail, or you might just need the grain now to do something useful with it. Charging for that uncertainty isn't theft. It's arithmetic.

The interesting thing about pirate enterprises is that the interesting thing about pirate enterprises from a financial perspective is that they operated almost entirely outside any credit system. No bank would lend to a pirate crew, and no interest rate applied to them. This sounds liberating until you notice what it meant in practice: no long-term investment, no proper ships, no infrastructure, no future. Piracy as a business model was permanently stuck in the present tense. You couldn't borrow against tomorrow if tomorrow had no legal existence.

The same logic that made thirteenth-century theologians nervous about lending – this slippery trade in future time – turns out to be exactly what makes economies capable of building anything at all.

Why the Bank Rate Is Never Just a Number

Which is why the Bank of England's rate decision is never just a number. When the Monetary Policy Committee votes to raise rates, they are, in a very old sense, making a statement about how much the future is worth relative to today. High rates shrink the present value of everything promised later: mortgages become expensive, investment slows, businesses think twice about borrowing to grow. Low rates say the future is nearly as good as now – so borrow freely, build things, take a punt. The medieval clergy would have found this whole system baffling and probably sinful. But the question driving it is one they'd recognise immediately. Is it fair to charge someone for time? We just answer it differently now.